
#include <machine/asm.h>


#ifdef _LIBC
#ifdef STRLCPY
WEAK_ALIAS(strlcpy, _strlcpy)           
#endif
#include "namespace.h"
#endif

/*
 * These are "naive" versions of the str*cpy routines designed to be simple
 * and small.
 */

#if defined(STRLCPY)
/* LINTSTUB: size_t strlcpy(char *, const char *, size_t) */
ENTRY(strlcpy)
	add	ip, r1, #1		/* save src pointer (+ NUL) */
	subs	r2, r2, #1		/* make sure there's room for a NUL */
	blt	3f			/*   no room, do the strlen */
	add	r2, r2, r0		/* get end of dst */
1:	cmp	r0, r2			/* room for another char? */
	beq	2f			/*   no, write NUL and do the strlen */
	ldrb	r3, [r1], #1		/* read a byte */
	strb	r3, [r0], #1		/* write a byte */
	teq	r3, #0			/* was it a NUL? */
	bne	1b			/*   no, do next byte */
	b	4f			/*   yes, end of string, so return */
2:	mov	r3, #0			/* NUL */
	strb	r3, [r0]		/* write to end of string */
3:	ldrb	r3, [r1], #1		/* read a byte */
	teq	r3, #0			/* was it a NUL? */
	bne	3b			/*   no, get next byte */
4:	sub	r0, r1, ip 		/* return length of src string */
	RET
END(strlcpy)
#elif defined(STRNCPY)
/* LINTSTUB: char * strncpy(char *, const char *, size_t) */
ENTRY(strncpy)
	mov	ip, r0			/* we want to preserve r0 */
	add	r2, r2, r0		/* get end of dst buffer */
1:	cmp	ip, r2			/* are at the end of dst already? */
	RETc(eq)			/*   yes, just return. */
	ldrb	r3, [r1], #1		/* read a byte */
	strb	r3, [ip], #1		/* write a byte */
	teq	r3, #0			/* was it a NUL? */
	bne	1b			/*   no, try next byte */
2:	cmp	ip, r2			/* are at the end of dst already? */
	strblt	r3, [ip], #1		/*   no, write a NUL */
	blt	2b			/*       until dst is filled */
3:	RET				/* return dst pointer */
END(strncpy)
#else
/* LINTSTUB: char * strcpy(char *, const char *) */
ENTRY(strcpy)
	mov	ip, r0			/* we want to preserve r0 */
1:	ldrb	r3, [r1], #1		/* read a byte */
	strb	r3, [ip], #1		/* write a byte */
	teq	r3, #0			/* was it a NUL? */
	bne	1b			/*   no, try next byte */
	RET				/* return dst pointer */
END(strcpy)
#endif
